摘要
根据实际资料,讨论了许靖华等关于华南碰撞造山带的主张。得出下列结论。1.许靖华的命题,"是华南造山带而不是华南地台"是正确的,它表达了华南地台盖层和中新生代盆地构造层发生褶皱,在一些部位伴随有强烈的岩浆活动。然而,新误解随之产生,提出脱离实际地质资料的新想法。2.华南大陆内没有如许靖华等所说的三叠纪碰撞造山带。第一,沿湘赣浙缝合带分布的"板溪混杂岩"。
Hsu et al.'s idea about the Triassic collisional orogenic belt of South China is discussed.The conclusion is reached as follows.(1)There occurred no'Indosinian orogeny'in South China,so the theory of'south China orogen formed by the Indosinian orogeny'does not hold water.(2)No Paleozoic Xiang-Gan-Zhe(Hunan-Jiangxi-Zhejiang)Ocean appeared and no Triassic collision between the Yangtze Terrane and the Huanan(south China)Terrane occurred.(3)'Banxi Melange'was formed before the Sinian(in the Proterozoic),which cannot be regarded as the basis for defining the Triassic collisional orogenic belt.The paper points out that South Chine belongs to the important constituent part of the Meso-Cenozoic Nanhua(South Cathaysian)subaerial tridirectional orogenic belt.The main Characteristics of the orogenic belt can be shown as follows:(1)The Nanhua subaerial orogenic belt is the orogenic belt formed by the folding deformation of the ancient folding besement,ancient geological formation,platform cover and Meso-Cenozoic baein structural stage in the Chinese contnental part of South China-Southeast Asia Playe accompanied by magmatic activity under the subaerial geoteetonic environment without ingression.(2)The Nanhua tridirectional orogenic belt is the orogenic belt charecterized by tridirectional optimized geotectonic lines of the NE,NW and NWW trendings formed respectvely in the sast part,west part and north margin under the subsynchrnous interaction of the three Meso-Cenozoic geotectonic domains of Northwest Pacific,Tethys and Kunlun-Qinling.(3)The folding deforming ages of the orogenic belt are considerably Iate and different in different regions.The synchronous- oarasynchronous folds were formed by polyphese inheriting folding since the Late Jurassic in the peri-Pacific region of the Northwest Pacific geotectonic domain and since the Late Eocene in the Changdu-Simao,Youjiang and Bayan Hat regions of the Tethys gectectonic domain as well as in the intra-continental region(Sichuan-Yunnan basin region)of the Northwest Pacific domain.There is no Indosinides in the orogenic belt.
出处
《广西地质》
1996年第1期79-90,共12页
Guangxi Geology
关键词
造山带
华南
三叠纪
碰撞造山带
南华造山带
subaerial tridirectional orogenic belt
Indosinian orogeny
Banxi melange
Meso-Cenozoic
South China.
